Adding different save data to one file

Question

I'm stuck at one of the last parts of my iApp, can someone help me?

I want to add different field entries of different .m files into one file without overwriting the file. (I also dont know how to make that save file btw).

I have 2 .h files with :

file1 : NSString *dataHML; NSString *dataHML2;

file2 : NSString *dataHML3; NSString *dataHML4;

I have in the first file1.m file :

-(IBAction)FirstSelection:(id)sender { UIImage *img = [UIImage imageNamed:@"sf5.png"]; [displayCharacterHML setImage:img];

if (count == 5) 
{ UIImage *img = [UIImage imageNamed:@"High-s.png"];
    if (img != nil) {
        [displayHML setImage:img];
        dataHML = [[NSString alloc] initWithFormat:@"H"]; 
        count = 6;
    }
}

-(IBAction)SecondSelection:(id)sender { UIImage *img = [UIImage imageNamed:@"sf6.png"]; [displayCharacterHML setImage:img]; if (count == 5) { UIImage *img = [UIImage imageNamed:@"Medium-s.png"]; if (img != nil) { [displayHML2 setImage:img]; dataHML2 = [[NSString alloc] initWithFormat:@"M"]; count = 6; } } }

then in the second file2.m i have :

-(IBAction)ThirdSelection:(id)sender { UIImage *img = [UIImage imageNamed:@"sf6.png"]; [displayCharacterHML setImage:img];

if (count == 5) 
{ UIImage *img = [UIImage imageNamed:@"High-s.png"];
    if (img != nil) {
        [displayHML3 setImage:img];
        dataHML3 = [[NSString alloc] initWithFormat:@"H"]; 
        count = 6;
    }
}

-(IBAction)SecondSelection:(id)sender { UIImage *img = [UIImage imageNamed:@"sf6.png"]; [displayCharacterHML setImage:img]; if (count == 5) { UIImage *img = [UIImage imageNamed:@"Medium-s.png"]; if (img != nil) { [displayHML4 setImage:img]; dataHML4 = [[NSString alloc] initWithFormat:@"M"]; count = 6; } }

How do i make the dataHML, dataHML2, dataHML3 and dataHML4 being saved into one save file?

If you can explain me this ill be very grateful, i've red things with NSUserdefault etc. but i couldn't make allot of sense of it since my question is quite specific.